SU944891A1 - Method of lapping piston rings along outer surface - Google Patents

Description

(54) METHOD FOR ADAPTING PISTON RINGS ON EXTERNAL SURFACE

one

The invention relates to mechanical engineering, and can be applied in the production of piston rings.

A known method of processing piston

rings on the outer surface, according to

which rings are set on tight

the mandrel and the processing is made by self-tapping honing head 1.

However, this method does not provide improved quality of processing rings.

There is also known a method of wiping piston rings on the outer surface, according to which the rings are assembled into a bag, compressed in the axial direction in a calibrated ring body, and then they are told to move inside the sleeve with an abrasive, and the rings are periodically released from axial compression 2.

However, this method does not provide a sufficiently high processing performance, since, due to the wear of the sleeve, the density of the fit of the rings to the sleeve when they are compressed in a calibrated ring body, not subject to wear, falls.

The purpose of the invention is to increase the lapping performance of the rings by eliminating the effect of liner wear.

This goal is achieved in that the release of the rings is carried out in the process of processing directly in the sleeve.

FIG. 1 shows the design of the device for implementing the proposed method of grinding the rings on the honing

10 machine tool; in fig. 2 is a section A-A in FIG. one; in fig. 3 - device, top view; in fig. 4 shows a section BB in FIG. 3

According to the proposed method, piston rings 1 are assembled into package 2, which is compressed axially, and

5 into the sleeve 3 with an abrasive coating and the package is conveyed to move within the sleeve, for example by rotating and axial reciprocating. Periodically in the process of processing a package of rings

20 are free from axial compression for a short time directly in the sleeve.

Processing is carried out as follows.

When moving a package of rings inside P1,1b: 5y 11 |) () not () lit, its wear and intensity of processing decreases. In order to restore the 1 1 1 intensity of removal of the allowance, the pack gauge is free of axial compression, so that the rings do not press more tightly against the sleeve. After that, the package is again compressed and continue processing. This cycle is repeated several times.

For the implementation of the proposed method of fitting the rings, an adaptation to the honing machine can be applied. It is coupled with the machine 4 rotation of the machine, the drive m 5 of the reciprocating movement of the spindle 6, the control mechanism 7, the unclamping mechanism 8. In the spindle 6 fixed movable clamping device 9. On the base plate 10 of the machine is installed; 1eno automatic boot device I 1 with the store-drive 12 and the fixed Cornus 13 with the sleeve 3.

The rotational drive 4 is intended to communicate the rotational movement of the pinch 6 and the movable clamping device 9 secured therein with the package of piston rings to be machined.

The reciprocating drive 5 is intended to communicate the reciprocating motion to the spindle 6 and the movable clamping device 9 with the piston ring package.

The control mechanism 7 is designed to adjust and control the stroke and non-run of the piston ring package during their reciprocating motion during the lapping process, which is adjusted using the working cams 14 and 15, control, and switching cam 16 connected to the hydraulic panel of the machine used. .

The unclamping mechanism 8 is designed for clamping the ends of a package of piston rings in the clamping device 9 when grinding them and pressing the package of piston rings when unloading them.

Automatic loading device 11 is designed to set the package of piston rings 1, load them into the work area and unload after processing rings. It consists of a magazine-accumulator 12, a receiver 17 with two movable jaws 18, pressed springs 19 with restrictive screws 20, with two stops 21 designed to set and crimp a package of piston rings, and a transport hydraulic cylinder 22 mounted on two racks 23.

The movable clamping device 9 is intended for clamping a package of piston rings 1 and imparting rotational and reciprocating movements to it during the lapping process. It includes a movable top plate 24 and a bottom plate 25, two guide pins 26, two adjusting screws 27, a hollow rod 28 held in the cup 29 from axial movement by the upper flange 30 and the bottom flange 31, in the lower part of which is fixed with a tongue 32 a clamping disk 33 connected by a pusher system 34 and 35 with an unclamping mechanism 8. The upper part of the pusher 35 is rigidly fixed with the help of a pin 36 in the spindle 6. The clamping device 9 also includes a spring 37, a supporting flange 38 mounted rotatably on the pin 39, which is fixed in the bottom plate 25.

The liner 3 installed in the fixed housing 13 is a tool for lapping the package of piston rings 1. To ensure the lapping of the outer rings, elements are also used that control various positions of the mechanisms that control automatic operation: contactless limit switches 40 and 41 with a cam 42 controlling the lower the position of the spindle 6, and the cam 43, including the rotation of the pinch 6, the unclamping mechanism 8 and the supply of coolant; contactless limit switches 44 and 45, controlling the position of the receiver 17; a pressure switch 46 controlling the operating pressure in the hydraulic system of the unclamping mechanism 8; an electromagnet 47 of a four-way spool 48 which intermittently briefly connects the upper cavity 0 of the unclamping mechanism 8 to a hydraulic tank (not shown), a first time relay (not shown) that controls the total duration of a ring ring packet processing cycle, a second time relay (not shown), a pause-controlling electromagnet, 5, 47, a third time relay (not shown), controlling the processing time of a compressed set of piston rings between the pauses, and a low-current contact 49, controlling the upper position; 8 Spreading.

Claims (2)

With the start-up cycle button (not shown) depressed on the control panel of the lower starting position of the spindle 6, when the cam 42 acts on the switch 40, the receiver 17 is in the left position; 5, the axis of its receiving opening is aligned with the axis of the storage magazine 12 and the movable jaws 18 are pressed under the action of the spring 19, as a result of which the piston rings from the storage magazine 12 fall into the receiving opening and form a package, while the mechanism 8 unclamping together with the pressure the disk 33 is in the upper position and acts on the low-current contact 49. The receiver 17 is moved by means of a hydraulic piston rod 22 into the right position under the spindle 6. A package of 2 piston rings is fed to the pad of the supporting flange 38, while The jaws 18 abut against the stops 21, crimping the outer diameter of the piston rings in loose condition to the diameter / ensuring the free entry of a package of piston rings into the opening of the sleeve 3. Receiver 17 acts on the switch 45, including moving the unclamping mechanism 8 together with the clamping disc 33, which clamps a package of piston rings on the ends; The pressure in the hydraulic system of the unclamping mechanism 8 rises and the pressure switch 46 is activated, turning on the coolant and moving the spindle 6 upwards, the cam 43, acting on the short-circuiting (short-circuit 1-1.5 s) electromagnet 47. The electromagnet switches the four-way slide valve 48, with a hydraulic tank, the upper cavity of the unclamping mechanism 8, as a result of which the pressure in it drops sharply, the pressure of the disk 33 of the package of piston rings stops at the ends, and the latter are pressed to the walls by the action of elastic deformation forces about the hole in the sleeve 3. After a pause (1-1.5 s) has expired, the second time switch turns on the third time switch and turns off the electromagnet 47, which turns off the four-way slide valve, the upper cavity of the unclamping mechanism 8 from the tank connection, resulting in pressure in the hydraulic system the package of piston rings sharply increases and is clamped again by the clamping disk 33. The process of grinding the piston rings in the sleeve 3 continues until the third time relay is activated, which is set for the processing time (10-30 s) of the compressed piston ring package between the pauses, which again turns on the second time relay, controlling the pause of the connection of the upper cavity of the unclamping mechanism 8 to the tank by turning on the electromagnet 47 with the four-way slide valve 48. At the same time, the bag is again released and the piston rings are set up by the hole in the sleeve. After the pause expires, the second time relay is activated and the processing continues. Such repeatability of pause inclusions for the self-installation of piston rings during the lapping process contributes to an increase in processing performance. Depending on the size of the allowance, the total cycle time is set within 90-450 seconds, adjustable at the first time relay. In the process of grinding the piston rings, 5-10 possible switchings are possible until the first time relay is activated. Thus, the proposed method of grinding the piston rings due to periodic restoration of the contact of their surface with the sleeve during removal of the seam allowance improves the productivity of the treatment. It is very simple and can be implemented when grinding rings on honing machines. Claims The method of grinding the piston rings on the outer surface, according to which the rings are assembled into a package, compress it axially in a calibrated ring body, and then tell it to move inside the abrasive coated liner, with the rings periodically being shortly freed from axial compression, characterized by that, in order to improve processing performance by eliminating the effect of liner wear, the rings are released during processing directly in the liner. Sources of information taken into account during the examination 1. USSR author's certificate No. 517473, cl. B 24 B 33/04, 1975. 2. Fragin I.E., Arshinov V.D. Diamond honing of piston rings of autotractor engines. “Machine tools and instruments, No. 9, 1970, p. 34 AT FIG.